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This quest has an in-depth guide. It contains a more detailed description of dialogue, cutscenes, and storyline.
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Details
| Start point | Talk to the Observatory professor in the Observatory Reception Room north of Castle Wars. Show on map |
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| Official difficulty | Intermediate |
| Official length | Short |
| Description | The Observatory in south-west Ardougne has been ransacked by a family of nearby goblins. Can you help the professor to rebuild it? |
| Requirements | None |
| Items required |
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| Recommended |
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| Enemies to defeat |
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Walkthrough
1: Observatory, a: Furnace (for molten glass and Bronze bar), b: Planks (2x), c: Copper and tin mines, d: Sandpit, e: Superantipoison(1), f: Antipoison(1) chest, g: Trader Crewmember (sells Soda ash and Bucket of Sand, both 5 coins each), A: Quest Area (Area to travel, from begin to end, if item collected beforehand).
Fixing the Observatory
- Speak with the Observatory professor. ( 1•2•1)…
1 Talk about the Observatory quest. 2 An Observatory? 1 Sounds interesting. How can I help? - Give the Observatory professor the three planks, bronze bar and molten glass (speak to him 3 separate times ( 1)…each time).
1 Talk about the Observatory quest. - Speak to the assistant.
- Go up the east hill and down the stairs.
- Once downstairs, search all the chests until you find the goblin kitchen key (most commonly found in south-eastern part when you go down the stairs, don't skip the dialogue once you find the key or you will not pick it up. If not found in the two chests directly south-east from the stairs, it is guaranteed to be in the last chest in the dungeon. The other chests will contain poisonous spiders.).
- Head north from the entrance in the dungeon, then go west to the kitchen gate and prod the sleeping guard, then kill or trap him.
- Open the gate and inspect the goblin stove.
- Go back and speak to the professor with the lens mould in your inventory. ( 1)…He will give back the needed molten glass for the next part.
1 Talk about the Observatory quest. - Use the molten glass on the lens mould.
- Speak to the professor to give him the lens mould and the observatory lens. ( 1)…
1 Talk about the Observatory quest. - Head back into the goblin dungeon.
- Run past the kitchen and climb up the stairs in the south end of the dungeon. (During the cutscene, DO NOT CLICK on anything in the observatory or you'll have to restart the cutscene)
Finishing up
- After the cutscene, talk to the professor upstairs and view the telescope. ( 1)…
1 Talk about the Observatory quest. - Talk to the professor again and identify the constellation you saw (see table below). ( 1)…
1 Talk about the Observatory quest.
| Name & Reward | Picture | Name & Reward | Picture |
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| Aquarius 25 Water runes, uncut sapphire |
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Aries 875 Attack experience, uncut sapphire |
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| Cancer Amulet of defence, uncut sapphire |
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Capricorn 875 Strength experience, uncut sapphire |
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| Gemini Black 2h sword, uncut sapphire |
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Leo 875 Hitpoints experience, uncut sapphire |
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| Libra 3 Law runes, uncut sapphire |
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Pisces 3 Tuna, uncut sapphire |
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| Sagittarius Maple longbow, uncut sapphire |
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Scorpio Weapon poison, uncut sapphire |
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| Taurus Super strength(1), uncut sapphire |
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Virgo 875 Defence experience, uncut sapphire |
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- Congratulations, quest complete!
Rewards
- 2
Quest points 
2,250 Crafting experience- Your item reward depends on what astrological sign you see when you look through the telescope. It is different for each person. Each one rewards an uncut sapphire as well as one of the following:
- Aquarius: 25 water runes
- Aries: 875
Attack experience - Cancer: An amulet of defence
- Capricorn: 875
Strength experience - Gemini: A black 2h sword
- Leo: 875
Hitpoints experience - Libra: 3 law runes
- Pisces: 3 tuna
- Sagittarius: A maple longbow
- Scorpio: Weapon poison
- Taurus: A 1-dose super strength potion
- Virgo: 875
Defence experience
- The Spirit of Scorpius will now give you a mould to make unholy symbols, and he will bless them for you too. He can be found in the graveyard north of the Observatory.
- Talk to the Observatory assistant after the quest and he will reward you with a jug of wine as well as tell you his and the professor's real name.
- Access to the grappling shortcut rock outside the Observatory.
- Completing this quest awards the player with 5 Kudos which can be claimed by talking to Historian Minas in the Varrock Museum.